ioctl_fcntl

Perform a special file operation (fctnl) or IO control operation (ioctl). They are considered the same by the kernel (handled by the same code), however, using the correct function is recommended for portability.

Syntax

#include <fcntl.h>

int fctnl (int fd, int operation, ...);

#include <ioctl.h>

int ioctl (int fd, int operation, ...);

Parameters

fd

The file descriptor to use.
operation

The operation to perform, see below.
...

Optional extra argument. Only one extra argument is allowed/used.

Operation types

F_GETFL

Get file flags.
F_SETFL

Set file flags.
F_SETOWN

Set file owner. Required by some drivers for signal delivery.

Return Value

The return value is null if successful. Otherwise, the return value is negative and errno is set:

EBADF

Bad file descriptor.

Remarks

For driver operations, check the corresponding driver.